Emma Watson, Leo di Caprio Go to Battle in a Fight for the Earth

In 2006, Al Gore rocked the world with An Inconvenient Truth, a documentary that single-handedly made global warming a hot topic of debate. Since then, climate change advocacies have become more mainstream. The annual Earth Hour, for instance, has been breaking records, challenging the world to turn off electricity for 60 minutes.

Celebrities who have their own environmental battle cry have also sent “earth” to pop culture territory. In honor of Earth Day on April 22, these are just some of the many activists who have made conservation and eco-friendly acts more urgent andin vogue:

Emma Watson

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Fashion has been charged with all sorts of environmental offenses such as the maltreatment of animals for leather and the production of unrecyclable waste. But Emma Watson is out to renew this reputation. She set up an Instagram account to chronicle her sustainable fashion choices. Here, you’ll see fashion brands that recycle materials and offer alternatives to animal skins.

What you can do: Support brands that use leftover fabric or have a designer customize a new piece out of unwanted clothes in your closet.

Gisele Bundchen

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Another sexy celebrity making waves in environmental advocacy is supermodel Gisele Bundchen. She signed on to be a correspondent for National Geographic’s Years of Living Dangerously and was named Goodwill Ambassador for the United Nations Environment Programme in 2009. Her advocacy is rainforest conservation. According to Bundchen, “this forest is providing a sustainable life for all of us in the planet, so I think it’s everyone’s problem.”

What you can do: Be part of projects that help stop forest denudation, which also causes floods.

Leonardo DiCaprio

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Climate change “deniers” are few and far between, according to Leonardo DiCaprio, who has argued for renewable energy in a meeting with Donald Trump. His namesake foundation has programs for wildland and marine conversation, and overall awareness of climate change. Like his ex-girlfriend Gisele Bundchen, DiCaprio is a United Nations appointee. He serves as Messenger of Peace for the Climate.

Edward Norton is a lifetime trustee of Enterprise, a group that provides housing to low-income families. One of its projects is Enterprise Green Communities, which funds the development of sustainable neighborhoods. The main tenet is conservation: Houses must be energy-efficient. To date, Enterprise has supported more than 500 housing organizations and rehabilitated 38,000 homes to be “green and healthy.”

What you can do: Support Earth Hour on March 25: Turn off your lights and unplug all electrical devices. Carry over the habit to your daily life by having a mini Earth Day for 30 to 60 minutes.